Pessoal, alguem sabe me dizer que erro e este? Alguns dizem que e normal, mas ta vindo de uma maquina da rede interna que nem esta fazendo acesso ao proxy.

Código :
Feb  9 09:20:01 potenza CRON[3392]: (pam_unix) session closed for user www-data
Feb  9 09:21:33 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:33 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:33 potenza squid[3104]: clientReadRequest: FD 40 (192.168.1.21:49493) Invalid Request
Feb  9 09:21:33 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:33 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:33 potenza squid[3104]: clientReadRequest: FD 40 (192.168.1.21:49494) Invalid Request
Feb  9 09:21:34 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:34 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:34 potenza squid[3104]: clientReadRequest: FD 42 (192.168.1.21:49496) Invalid Request
Feb  9 09:21:34 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:34 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:34 potenza squid[3104]: clientReadRequest: FD 42 (192.168.1.21:49497) Invalid Request
Feb  9 09:21:34 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:35 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:35 potenza squid[3104]: clientReadRequest: FD 19 (192.168.1.21:49498) Invalid Request
Feb  9 09:21:35 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:35 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:35 potenza squid[3104]: clientReadRequest: FD 19 (192.168.1.21:49499) Invalid Request
Feb  9 09:21:54 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:54 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:54 potenza squid[3104]: clientReadRequest: FD 30 (192.168.1.21:49503) Invalid Request
Feb  9 09:21:54 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:21:54 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:21:54 potenza squid[3104]: clientReadRequest: FD 30 (192.168.1.21:49504) Invalid Request
Feb  9 09:22:10 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:10 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:10 potenza squid[3104]: clientReadRequest: FD 33 (192.168.1.21:49533) Invalid Request
Feb  9 09:22:10 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:10 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:10 potenza squid[3104]: clientReadRequest: FD 33 (192.168.1.21:49534) Invalid Request
Feb  9 09:22:11 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:11 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:11 potenza squid[3104]: clientReadRequest: FD 57 (192.168.1.21:49541) Invalid Request
Feb  9 09:22:11 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:11 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:11 potenza squid[3104]: clientReadRequest: FD 57 (192.168.1.21:49542) Invalid Request
Feb  9 09:22:11 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:11 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:12 potenza squid[3104]: clientReadRequest: FD 61 (192.168.1.21:49545) Invalid Request
Feb  9 09:22:12 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:12 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:12 potenza squid[3104]: clientReadRequest: FD 61 (192.168.1.21:49546) Invalid Request
Feb  9 09:22:12 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:12 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'
Feb  9 09:22:12 potenza squid[3104]: clientReadRequest: FD 64 (192.168.1.21:49549) Invalid Request
Feb  9 09:22:12 potenza squid[3104]: parseHttpRequest: Requestheader contains NULL characters
Feb  9 09:22:12 potenza squid[3104]: parseHttpRequest: Unsupported method '^V^C^A'